Thermosetting resin composition having rubbery polymer particle dispersed therein, and process for production thereof
View Patent ↗A thermosetting resin composition having rubbery polymer particles dispersed therein of the present invention, that does not precipitate the thermosetting resin rubbery polymer particles over a long period of time, has excellent fluidity, is easily cured and molded, and sufficiently exhibits original properties of the thermosetting resin, comprises 100 parts by weight of a thermosetting resin, and 1 to 80 parts by weight of rubbery polymer particles, the rubbery polymer particles being dispersed in the form of a primary particle, wherein the solid content concentration is 60% to 90% by weight, and the water concentration is 3% by weight or less, and can efficiently be produced industrially in the state that the rubbery polymer particles are maintained in a stable state. The composition can be produced by a process for production of a thermosetting resin composition having rubbery polymer particles dispersed therein of the present invention, comprising a concentration step of deaerating a gas phase adjacent to a mixed solution comprising the rubbery polymer particles, the thermosetting resin, water and an organic solvent to reduce the pressure therein, thereby reducing the amounts of the water and the organic solvent in the mixed solution.
1. A thermosetting resin composition having rubbery polymer particles dispersed therein, comprising 100 parts by weight of a resol-type phenolic resin, and 1 to 80 parts by weight of rubbery polymer particles,
wherein the rubbery polymer particles are dispersed in the form of a primary particle, and
the solid content concentration is 60% to 90% by weight, and the water concentration is 1.2% to 3.0% by weight.
2. The thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 1 , wherein the solid content concentration is 60% to 80% by weight.
3. The thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 1 , wherein the rubbery polymer particle has a core-shell structure comprising at least two layers of a inside rubber particle core, and an outermost shell layer, the inside rubber particle core comprises a rubbery polymer having a glass transition temperature of 0° C. or lower, and the outermost shell layer comprises a shell polymer having a reactive group.
4. The thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 3 , wherein the resol-type phenolic resin further comprises an organic compound having reactivity, and the organic compound having reactivity is a novolac-type phenolic resin.
5. A process for production of the thermosetting resin composition having rubbery polymer particles dispersed therein, comprising
a dilution step of adding a ketone-based organic solvent to a mixed solution containing rubbery polymer particles, a thermosetting resin, water and an organic solvent, to form a diluted mixed solution, and
a concentration step of reducing pressure of a gas phase adjacent to the mixed solution, thereby reducing the amounts of the water and the organic solvent in the mixed solution,
wherein a combination of the dilution step and the subsequent concentration step is conducted 2 or more times.
6. The process for production of the thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 5 , wherein the ketone-based organic solvent is methyl ethyl ketone and/or methyl isobutyl ketone.
7. The process for production of the thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 5 , wherein the water concentration of the mixed solution is 10% by weight or less, and the molar composition ratio of water in the gas phase is higher than the molar composition ratio of water in the solvent component in the mixed solution.
8. The process for production of the thermosetting resin composition having rubbery polymer particles dispersed therein according to claim 5 , further comprising a purification step which comprises mixing an aqueous latex comprising the rubbery polymer particles with an organic solvent having partial water-solubility to conduct demulsification, and then adding water to the demulsified mixed solution, thereby forming slurry containing aggregates of the rubbery polymer particles.